Fuel-air mixture feed device of the multiple cylinder and multiple carburetor type for an internal combustion engine

Abstract

A fuel-air mixture feed device for use with a multiple cylinder internal combustion engine having at least one carburetor for high loads, and at least one carburetor for high and low loads, comprising main conduits connecting the cylinders to the carburetors and at least one branch conduit connecting the main conduits to each other. By this arrangement, the carburetor for high loads is rendered inoperative at low loads and the carburetor for high and low loads is operated to feed fuel-air mixtures to the cylinders, while all the carburetors are operated at high loads so that maximum power can be obtained at all time.

What we claim is: 
     
       1. A fuel-air mixture induction system for use with a multiple cylinder internal combustion engine, each of said cylinders having an intake port and an exhaust port, the improvement comprising a plurality of carburetors wherein the number of carburetors is equal to the number of cylinders of said engine, each of said carburetors having a variable throat, a main intake conduit interconnecting said variable throat of one carburetor with the intake port of one of said cylinders, a branch conduit coupling at least a pair of said main conduits into communication, means operatively connected to said carburetors for rendering said carburetors operative for feeding a fuel air mixture to their respective corresponding cylinders during both high and low load operation of said engine, and means for directing the fuel air mixture to said branch connected main conduits during low load operation only, and an operating means coupled to said last two mentioned means for simultaneously and proportionally controlling the operation of said respective last two mentioned means whereby the optimum fuel-air mixture is introduced into the respective cylinders in accordance to the operating load imposed on the engine so that during high load operation, the fuel-air mixture is supplied directly through the main conduits interconnected between the respective carburetors and corresponding connected cylinders, and during low load operation, the fuel-air mixture is supplied through the carburetors supplying said branch connected main conduits, said first-mentioned means being operatively connected to each of said carburetors for varying the throat thereof a corresponding amount, sand said second means comprising a valve means disposed in certain of said main conduits, and said operating means being connected to said first means and said valve means for proportionally controlling said first means and valve means so that said first means is rendered operative during both low and high engine loads and said valve means is closed at low engine loads.